Do you mean, that they are not visible under "boundary conditions" in Fluent? Then, I am 99% sure you did something wrong in ICEM.
What do you use for meshing in ICEM? Hexa with blocking?

thanks for ur reply...
i used Hexa mesh (free mesh)...when i tried to do some model example in ICEM..its coming correctly in FLUENT.. but my actual model getting some problem in boundary condition while transferring it from ICEM to FLUENT...